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A. B. DAVIS. Oar Spring. No. 231,019. Patented Aug. 10,1880.

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N.FETEHS. PHOTD-LITHOGRAPHER. WASHINGTON. D. C.

UNTTeo STATES @PATENT OTricia@ AUGUSTUS B. DAVIS, OF PHILADELPHIA, PENNSYLVANIA, ASSlGNOI-t OF NINE-TVVENIIETIIS OF HIS RIGHT TO JOHN K. BOYER, OF SAM E PLACE.`

CAR-SPRING.

SPECIFICATION forming' part 'of Letters Patent No. 231,019, dated August 10, 1880. Application tiled May 18, 1880. (No model.)

To all whom it may concern:

Be it known that I, AUGUSTUS B. DAVIS, a citizen ofthe United States. residing in the city and county of Philadelphia, and State ot- Pennsylvania, have invented a new and useful Improveinentin Springs i'orOars, Sac., (Oase B,) which inil'irovement is fullwv set i'orth in the following speeication, and accompanying drawings, in whieh- Figure l is a side elevation, partly sectional, ofthe spring embodying my invention. Fig. 2 is a top or plan view thereof. Figs. Il and 4 are perspective views of detached portions thereot'. Fig. 5 is a t-ransverse section in line x x, Fig. 1.

Similar letters ot' reference indicate corresponding parts in the several figures.

My invention consists of a reversible duplex spring formed of two parallel sets ot', spring plates and clamps located centrall)Y on opposite outer faces ofthe two sets. The ends ot' the springs are fitted to boxes whichare connected by a longitudinal bar, the boxes and bar forming a su])porting-frame which is strongand durable, and admits oi' reversibiliiy. The ends ot' the springs rest on followers which have rocking motions on bearing-pieces in the boxes, thus preventing wiping or rubbing and wearing action of the spring on the followers and boxes and the tie plate or bar of the latter.

Referring to the drawings, A represents two sets ot springs arranged parallel, and each formed ot a series or pile of tlat plates, preferably of rboniboidal forni, the broadest or greatest surfaces thus being at the centers of said plates.

B represents the springframe, which is formed ot' boxes B, cast with or secured to the ends of a longitudinally-extending tie-bar, B", said boxes being adapted to receive the pointed or tapering ends of the springs A. It will be noticed that there is a box, B', at each end of the upper and lower sides ot' said bar B, each pair of boxes thusieceiving the ends of a set of springs.

C represents clamps which are located centrally on the opposite outer faces of the two sets of springs, each clamp being open attwo sides and at what may be termed its botposes.

l toni,7 the closed sides embracing the central portions of the springs. rlhe outer pieces of said clamps, or what may be termed the top 7 and fbottomf7 have the faces which are in contact with the springs of convexorsegniental forni, the convexity or curvature being greater than any curvature which the spring' may assume.

Hthin the boxes, at the base thereof, are placed bearing-pieces l). oi' steel orother hard 6o metal, against which rest rocking followers E, the curvedfaces whereof are in contact with the bearing-pieces,and Lhe-other faces, which are iiat, accord with the contiguous portion of the springs, as clearly shown at the right hand of Fig. 1.

The clamps areconnected byboltsorlinksF, which retain the springs in position and guide the clamps in their motions, the length ot' the bolts or links being less than theheight o1" the 7o spring, so that when the clamps approach each other the bolts or links do not strike the spring planks or bearings with which the clamps are in contact.

'Ihe spring is supported on the spring-plank 75 or suspended in the usual way otswinging holsters, or otherwise supported or suspended, it being noticed that the clamps project respectively above and below the sets ot springs, the lower clamp being sustained on the place 8o of support or suspension, and the weight of the ca-r or other vehicle or object rested on the upper box. The weight thus superiinpostal on the clamps as bearers for the load is transmitted to the centers or widest portions ot' the 85 two sets ot springs, thus detiecting and shortening the springs and causing the followers E to roll and contorni to the motions of the ends of the springs, thus securing to the spring the saine endwise motions as when it straight, 9o and preventing all wiping or rubbing and wearing action ofthe spring on the followers.

NVhen the spring, from long use or otherwise, is set out of a straight line the clamps are removed, one or both sets ot springs are reversed, and the clamps are again applied and secured, so that the spring renders service anew and obviates the displacement ot' the plates for straightening and tempering purloo It Will also be seen that I produce a spring` that is inexpensive, may be readily produced and conveniently set up, possesses great resiliency, and rides easily.

The degree of resiliency may be adjusted by increasing,` or decreasing the number' of sprin plates.

The bearing-pieces D, which prevent Wearing action on the boxes and tie plate or bar B, may be removed and replaced when worn or broken.

Two or more duplex-springs, constructed as above, may be coupled side by side and employed as desired or required.

Having thus described my invention, what Iclaim as new, and desire to secure by Letters Patent, is

1. A reversible duplex spring` having' two sets of end-supported spring plates and clamps at the centers of opposite outer faces of said sets of plates, said clamps being,` provided with the slotted guides F, substantially as set forth.

2. In combination with two sets of springplates, the longitudinal tiebar an`d end boxes, the removable bearing-pieces D, and rocking followers E, substantially as and for the purposes set forth.

A. B. DAVIS.

Witnesses:

J oHN A. WIEDERsI-IEIM, W. F. Kraai-1ER. 

